June 06, 2007

Windows Messenger allows real-time communication with other contacts who are using instant messaging (IM) services including those provided by the Session Initiation Protocol (SIP) as offered by Microsoft Office Live Communications Server. Windows Messenger also provides connectivity to the Microsoft .NET Messenger service and Exchange 2000 Server Instant Messaging Service.

The latest version of Windows Messenger version 5.1 includes the following version numbers:• Microsoft Windows Messenger version 5.1.0706 (release date: June 4 and 2007)• Microsoft Windows Messenger version 5.1.0700 (release date: September 16 and 2005)• Microsoft Windows Messenger version 5.1.0680 (release date: May 13 and 2005)• Microsoft Windows Messenger version 5.1.0639 (re-release date: March 24 and 2005)• Microsoft Windows Messenger version 5.1.0639 (release date: December 1 and 2004)